Alarm system



Feb. 21, 1950 D. B. TALBOT ALARM SYSTEM Filed sept. zo, 1948 4sheets-sheet 2 Fig. 2. l!

42 V A\/ A Inventor Dov/'d 5, Talbo/ Feb. 2l, 1950 v D. B. TALBOT2,498,613-

ALARM SYSTEM Filed sept. zo, 1948 4 sheets-sheet s Inventar David B.Tcl/bof Feb. 21, 1950 D. B. TALBOT 2,49811513A v ALARM SYSTEM Filedsept. 2o, 194s -4 sheets-sheet 4 i; A428 F i F 7 i f 67 66 T1:(1111111111, I

Inventor David B. Talbot @Mm aaa/Wwe; M5161;

Patented Feb. 21, 1950 ALARM SYSTEM David B. Talbot, Britton, Okla.,assigner of onetenth to H. S. Brimm, one-tenth to H. W. Sims, andone-fifth to Frank W. Jones, all of Oklahoma City, Okla.

Application September 20, 1948, Serial No. 50,055

12 Claims. l

'I'his invention relates to alarm systems using the telephone lines of asubscriber for transmitting an alarm to a predetermined alarm stationand it has for its main object to provide a completely automatic alarmsystem capable of calling any station within the telephone network whichhas been designated in order to receive the required alarm messagepreferably in the form of a spoken message repeated from a record.

Systems are known in which alarm circuits are operating transmittersbroadcasting a message or in which such a message is delivered overspecial lines or over telephone lines which have however to be tapped inorder to connect with them special alarm apparatus. The rst namedsystems may only be used in connection with a special organization oflisteners to the broadcast and are moreover hardly reliable. The secondmethod is not accepted by the operators of a telephone system, becauseit puts loads and connections on the lines which may cause seriousdisturbances and accidents.

It is therefore the primary object. of the invention to provide meanswhereby any predetermined subscriber station of the telephone networksuch as a fire department or a police station may be automaticallycalled upon the closure of an alarm circuit and in which, when theconnection with the said subscriber station has been completed, arecorded message is delivered over the telephone lines which may bepicked up in the receiver of the called station in the usual manner.

It is a further object of the invention to provide an alarm system withdialling means, which are operated to call the desired station atregular intervals delivering the message between said intervalsincessantly until the operation is stopped.

It is a further object of the invention to provide an alarm system withrecording and dialling means which start their operation, when an alarmimpulse has been given, and which continue their operation regardless ofwhether the alarm impulse persists or disappears.

It is a further object of the invention to provide an alarm system withrecording and dialling means which start their operation upon theproduction of an alarm impulse but the operation of which may be stoppedby the operator at the remote station when the alarm message has beenreceived.

It is a further object of the invention to provide means of such typethat short impulses are sulilcient to controlall operations which, onceinitiated, continue regardless of the duration of the electric controlimpulses.

Further more specific objects will be apparent in the course offollowing the following detailed specification.

The invention is illustrated in the accompanying drawings and isdescribed by way of example only. It will be readily understood that theexample shown and described intends to explain the principle on whichthe invention is based and one of the best modes to apply thisprinciple. This explanation will provide sufficient information to theexpert skilled in the art to apply the same principle or principles in amodified way to other cases, and modifications of the example shown aretherefore not necessarily departures from the essence of the invention.

In the drawings:

Figure 1 is a diagram of the connections used in the system.

Figure 2 is a partly sectional elevational view of the relayA unit thesection being taken along line 2-2 of Figure 3.

Figure 3 is a plan View of the relay unit.

Figure 4 is an elevational View partly in section of the recording unit.

Figures 5 and 6 are a plan and an elevational View respectively of thethermostatic alarm contact unit with the cover removed.

Figure 7 is a diagrammatic view of the general arrangement of the unitsused. Figures 8 and 9 are iront and rear elevational views of thesolenoid and slide of the dialling unit.

The principle on which the alarm system according to the invention isbased may best be explained in connection with Figure 'l of the drawing.

If it is assumed that a home, hotel, boarding house and the like is tobe protected, the system consists essentially of the thermostatic orother feelers F of which a number is provided in the rooms, closets,garages, etc., to be protected, of the telephone T and of the automatictransmitter A. Some of the ieelers F may of course be contacts operatedby illicit entry into the house or rooms and therefore may form part ofa cornbined re and burglar alarm system. These feelers put intooperation the automatic transmitter A which dials the call number of anyfire department or police station which may have been set and thereafterdelivers automatically a message stating the nature of the emergency andthe location of the premises. When the message has been delivered andhas been taken down, the

attendant in the exchange of the fire department or police stationcloses a relay circuit which terminates the further operation of thetransmitter.

The telephone T is the ordinary business telephone and its peculiarityconsists merely in the use of a special or second dialling loop circuit,which is interrupted as long as the transmitter does not work, butwhich, upon operation is switched in and, as soon as switched in,operates very much as the usual loop circuit over which dialling takesplace and the conversation is conducted.

As will be seen from the above the most important unit of the system isthe automatic transmitter A which performs all the above namedfunctions.

- This automatic transmitter consists essentially of a relay arrangementgenerally indicated at ID in Figures 1 and 2 which is operated by thefeelers in an emergency and which closes all the circuits z'which arenecessary fcr the 'transmission of the message. It further consists vofa dialling system -generally indicated at -I I in Figure l and of .arecording and message delivering system generally indicated at 2I6 whichalso includes an amplier. It finally includes a remotely controlledrelay switch generally indicated at 86 in Figure 1 which stops thefurther operation.

All the units are operated either directly from the means carrying theusual 110 or 220 volt A. C. or `from a step down transformer 65connected with the same. v

The electromagnetic relay arrangement generally indicated at I0comprises a laminatedv core I2 mounted on a base plate Il and carryingthe energizing coil I Iy the connection of which is "described below..The core acts on a laminated armature member .I4 which is pivotally:supported on a pin I5 around which it may rock. The contacts of therelay are also mounted in a row on the base plate I'I. Four fixedcontacts 45, 46, 41, v48 are shown which all come into contact withcorresponding contact springs 52, 54, 56, 58 operated by the relayarmature uin ia manner to be described. One contact 49 is so positionedthat it comes into contact with its spring (54) when the rlatter is inits original position. This Contact is connected with the feelercircuits 66,61.

The movable contact springs 52, 54, 56, 58 are roperated by means ofarms .IB projecting from tthe armature member I4 :and carrying a-I pin2l), on which two push members 't6 having inwardly turned edge portionsor flanges 22 areI mounted. These members are pushed or moved upwardlywhen 'the relay ycoil lI I is energized.

The vbase plate I1 moreover carries two approximately triangular ortapering supporting plates 42 which, by means of a pintle or pivot pin28 `at or near their top, pivotally support ay rocking uni-t generallyAdesignated by 46 to Ywhich the movable contact springs 52, 54, 56, 58are attached. This unit comprises a horseshoe shaped yoke member 38 onthe outside of which wing plates 50 are fastened on which the movablecontact springs are mounted. To the central portion ofthe yoke aU-shaped holder v36 is riveted which has depending portions 4I carryinga pin 34. On both sides of this holder but within the space encircled bythe yoke member 38, and arranged between the inwardly turned flanges 22of the push members I6 are-swing members 24 with a tapering ortriangular leg portion 23 supporting a head 43 of large dimensions sothat shoulders v-44 areY formed between) said 'body and the transformerleads '64.

the members 24 may swing. The swing members on both sides are joined bya pin 26. Between said .pin226 `and the pin 34 ycarried by the dependingportions of member 36 a .horseshoe shaped or semicirculary spring 30 isarranged coupling the members 36 and 24 by its tension.

However it will be seen that the members 24 may assume two positionsinto which they are urged and in which they 'are held by the spring 30,one of vwhich is determined by the leg 23 finding its rest on the angev,-22 of push member i6 on the right fside `(Figures l2 and 3) while theother is determined by the same leg resting on the flange onthe leftlside. Which position will be assumed next will be determined by theposition in which it rests for the time being. For when the leg 23 ofmember 24 rests Aon the Yleft flange 22 vin in Figures 2 and 3 theshoulder -4'4 on the right side yof the head 43-rests lon pushVr-nern'ber I6 and when the'leg member I23 rests on the right flange 22the shoulder 44 on the left side -ofhead 43 rests on said member I6. Aliftingof the push member will therefore causevthe member A24 to swinglto the left or to `the right according to the position .it occupies atthetime.

It will yalso be clear that the tension spring 35 in the position shownin Figure l2 will urge the end of .leg 23 against flange 2K2 and.simultaneously presses on pin r34 urging it toward the right in Figure2. Therefore the .yoke member 38 and the wing plates '50 'together withthe contact springs attached 'to it are urged to turn counter-clockwisearound .pivot A26v and are therefore held in the position .shown inFigure 2 in which contact spring 54 'rests on the 4lower fixed spring45. AWhen however the .relay is energized for the rst time larm IB andpush member 'I6 are'lifted, andthe swing member 24 .is moved tothe otherside, Atilting the horseshoe member 38 and bringingthe movable contactsprings Ainto contact with .the upper iixed .springs 45, 46, 41, 46. Thenext energizaton will restore thelposit'ion rst described and so forth.It will be understood that lit is immaterial whether or not the .relay.remains energized for some time and a short energization determinesmechanically which ycontacts remain operative.

The relay as seenf'rom. Figure 1 is .energized from the main conductors6I, 63 of the building (which are usually v1710 -v. or 220 v. A. C.mains) by means of `a transformer v'65 furnishing a current of smallervltage. It wis also seen ithatwhen the relay `is at restthe'XedcontactAS on which the movable contact spring 54 rests isconnectedwith the feeler circuit 61, 66 while the contact spring 54 isconnected with the relay winding -II which in its turn is xedlyconnected with one of The vrelay unit I0 as already. explained controlsthe operation of the dialling unit .II- rand the message deliveringyunit 2H! connecting with the telephone.

.The message delivering'un-it 2'I`Il shown .in Figure 4 comprises amotorv60 -of Aany approved type driving a shaft IM which by means of a bevelgear ,605, -ll6drives .a main driving shaft |01 from wh'i`ch the motionof the recording unit and of the dialling unit are both derived.

The recording .unit consists of two dr-ums 108,

I I8 each provided witha spiral groove larranged Yin the. manner 0f 1.a'Sgw. fhr'ed. with. the tures closely adjacent to each other. The pitchof the spirals in the two drums is in opposite direcfy tion. An endlesssteel vwire |20 is heldin said grooves and is wound on each drum in manyturns; it then passes on to the second kdrum where it is wound ina likemanner. Rotation of one of the drums will also rotate the second drum asthe wire acts as a motiontransmission member. It will however be clearthat the wire |20I during such rotation is moved constantly as it isunreeled on one end andreeled up on the other end of the drum.

The wire |20 carries a magnetic record made in the usual way. The recordcontains merely a message stating the nature of the emergency, the exactlocation of the premises and if necessary additional information such asthe location of the key, the storing of inflammable material requiringspecific extinguishers or the like whic is repeated again and again.

In the space between the two drums a magnetic head of the usual type isarranged in which the cross magnetization of the wire is translated intoelectric currents as usual, which are then amplified in an amplier |35.The amplifier is energized by a branch line 68, 10 connected with theenergizing circuit 1|, 12 which is controlled by one of the contactsprings 45 of the relay unit l0.

Its output is delivered over a transformer |31 into the `telephone line|06, |29, 91, 58, 48, |38, |39 of the subscriber station.

The dialling unit ||0 comprises a disk ||2 provided with a cut |44 andcarrying an arcuate cam rail |33 .and a number of groups of pins |40,|a, |4019, |400 the purpose of which will be explained below. Moreoverthe disk carries an insulating cam block |21 which cooperates with apair of springs |2|, one of which is provided with a head |24 adapted tobe pressed against the other spring when the cam block rotates past it.Thereby a circuit |25 is closed during the passage of the cam block. y

The disk H2 is driven by a shaft ||3 on which a toothed wheel is keyedwhich is driven by a small pinion |03 which is carried by the maindriving shaft |04. As the latter is driven by motor 6i) it will be clearthat when the motor is energized disk ||2 will be driven at a speedwhich will be determined by the ratio of pinion |09 and toothed wheelShaft |43 also drives a disk or pulley |02 by any appropriate means. Forinstance the shaft may carry a pulley ||4 which by means of some belt,or by other means drives a second pulley |02, rotating around an axis|'0| and carrying a cam' block |03 cooperating with a pair of contactsprings |22. One of these springs |23 is provided with a headcooperating with the cam block |03 and is pressed towards the otherspring when the cam block presses on the head of spring |23. The pair ofsprings |22 is included in the circuit |25 which also contains springs|2| It will be clear that the rotational speed of pulley |02 will bedominated by the ratio of the diameters of pinion |03,.wheel pulley ||4and pulley |02.

Nearvdisk |2 a solenoid unit |28 is placed which consists of a solenoidcoil |26 (Figures 1, 8 and 9) with a core |43 which is attached to aslide piece |36 by means of a spring |3l. The slide piece is guided bythe guide rods and is moved against the action of springs |42 woundaround the guide rods which are interposed between the slide and a xedbase. This slide moreover carries a small 6 roller |32, adapted topassthrough cut |44` or disk 2 when the latter is in the proper positionwith respect to the slide and it moreover carries aprojecting bracket|46 on which a pair of springs |29 is mounted.

One of these springs of'the pair is provided with a head|69 cooperatingwith the arcuatel rail |33 which separates the springs as long a it isincontact with the head |69.

It will also be clear that the rail |33 can only act onv the pair ofsprings when the solenoid |26- is energized and the bracket thereforebrings the pair of springs into operative position with respect to camrail |33.

Moreover it will be understood that when the. solenoid |26 is energizedthe small roller |32 will run on top of the disk ||2vthe spring |3|permitting the movement of the core |43 even when the slide cannotfollow. The spring is however tensioned and as soon as the cut of thedisk reaches the place below roller 32, the latter pass,- es through thecut. Even if the solenoid is now deenergized the roller |32 will beheldbelow the disk and the slide will occupy a position corre-l sponding tothe energization of the solenoid. In

- this position the cam rail |33 separates the l comprises preferably anelectromagnet 90, energized by conductors 0|, 93 containing preferably(but not necessarily) condensers 95. The lines 6|-, 33 are connectedwith the telephone lines |00, |33. In the exchange (not shown) a switchmay be provided, preferably associated with an im-` pulse generator,producing a number of impulses to which the condensers are tuned, bymeansof` which the electrom'agnet 90 may be energized. Thiselectromagnet attracts armature 85 and closes the circuitv through relaywinding. 'TheA energization of the relay then brings the yoke member 38back into its original position.

The temperature feeler F is finally lshown in Figures 5 and 6. Itconsists of a base |50 on which an angular bracket |54 is mountedcarrying a bimetallic strip |52. The tip of the bimetallic strip maycarry a plate |58 with a terminal lpost to which one of the lwires 61 isattached.

The other wire 66 of the feeler circuit leads to =a terminal screw |53the point of which projects from a bracket |54 mounted on the base |50.When the bimetallic strip |52 is heated it exes and .bends itself untilat a certain temperature the plate |58 is pressed against screw 53 andthe circuit 66, 61 is closed.

vThe operation of the system is the following.

Assuming that one of the thermostatic or entrance guarding contacts Fisclosing one of the circuits 66, 6 1. and further assuming that the relayunit |0 is in the position shown in Figure 2 avcircuit will be closedfrom secondary of transformer 65 over conductors 66,.unit F andconducpassing through pivot 28 in Figure 2. The springv 30 thereforepresses` pin 34 to the left in FigureZ azi-came s' and l'Contact springs512,511, 56, 58come into 'c'ontactwith contacts 45, V'46, 47, 48.

This position will Avbe maintained even lif the impulse 'throughvrelaywinding `was only la transitory impulse. Y

Thejchange oi position -of the member '50 carrying'thecontact springscloses a number of circuits. First fthe-circuit through motor 60 isclosed at contact spring 52. Thiscircuit runs from main line 6| over 1|to motor gv(ill, Vand over 'l2-e45- `'2-14 to 63.v The motor 6|!`Vtherefore starts to run.v Current is also supplied over 1B and v618 tothe ampliiier |36. As irom'this current the Iain-- plier tube filamentsare supplied with current the amplier starts to warmup. With the startof vthe -motor'the shaft |64 starts to rotate, rotat- `'Contactsprin'gfe which noW is moved over to contact-46 brings the winding Hinto rthe circuit 8,4 So'that it is operable from the exchange.

Contact spring 56 -closes the circuit of alarm 'The gear ratio between|09 and I yand the mot tor vspeed are so selected that disk ||2completes a vrevolution in say ten seconds. Disk |02 4then is driven 'atVa speed which corresponds to one revolution in say forty-ve seconds. f

Simultaneously the drum |08 starts t0 rotate and the wire |20 is drawnthrough the magnet head, producing small induction currents sent to theamplifier over Wires 8|, 83.v The Wire |20 is continuously drawn alongas will be clear as longas the'motor drives the'drum 08.

Finallycon'tact spring 58 closes the dialling loop connected with thetelephone (andgi-nrparallel `'to the usual lo-op) this circuit vrunningover |365- 48-158-97 springs IZB-440|).

After the warming time for the Aamplie'r 'Scam block 'm3 closes 'springs|22 and cam block |21- closes springs |2i. Therebythepre'forme'd circuitr through the solenoid |26 (traced above) is closed and thesolenoid 5|26 'attracts its core and' pulls the vslide |39 down. Whenthis occurs Ythe cut |54 should be beneath the roller |32. The roller13-'2 is therefore caught by the underside 'of L`the Arim of vthe diskandthe slide is helddown even if the solenoid is deenergi'zed.

The Asprings |29 are now coming intoeontact withcam rail |33 and theloop circuit is broken.

This Ybreaking of the loop circuit hasto precede a call on the dial. Itcorresponds to the replacing of lthe receiver Apreceding every call.Should for instance the called subscriber's line be vbusyitis" necessarybefore a second call ismade to restore the receiver toits hook or seatin order to break theloop circuit before dialling. t y

In order that calling of the number of 'the fire department mayvcontinue indefinitely at short intervals Without restoring the relay toits original position a special means for breaking thefloop circuit hastherefore to be provided Which'me'ans consists in the cam rail |33 andthe springs |29.

Thedisk continues 'to rotate andthe head |69 now first closes 'the loop`(Correspending 'to the `lifting oi `the receiver) and then threeinterrup- Gil tions fior example foccur by means Aof pins I 40. Thiscorresponds -to the dialling of the first digit of the'nuniber'assumed'to be"3. Then the next digits follow when the groups of pinsMila, |401), l-c follovv.

{Ai-ter the -re rdepartment exchange has been reached the telephone`lines are connected and the recorded message is delivered yfrom head|35 over l82|, -B3to amplifier |36 and from Vamplifier over transformer|31 tolines 'Iilll and |39.

VqIfhe slide lie meanwhile, after a revolution is completed, returns assoon as the' cut IM reaches the position shown lin vFigure 1 in whichthe roller i3-2 may ipass fthrough the cut. The pair offsprings 12'9 isvthereby lifted and is no longer opened =by 'fthe f'ca-m rail Aand thepins, so that the message will not A'be disturbed.

""Howeverafter `a certain number of revolutions of disk "H2 the processof calling is repeated, when the cam block llili on disk |92 has made afull 'turrr Inthis ycase the pair of springs |22 and '|21 again 'closessimultaneously, the solenoid y'|235 is energized and the vcycle asdescribed is repeated. This repetitionoccurs again and again las "long-as the contact springs of the relay varefinthei'roperative position.

When the operator in the exchange has taken down or hasmade a record ofthe message he may stop lfurther operations by sending for in stance vacurrent with a certain number of impulses finto the 1line which passescondenser 95 vmember it fand tilts members 38 and 56, so that the-contact springs Vresume the position shown in "Fig-urefl. tThearrangement `is now restored andisre'ady for/another operation.

t will lbeclear that the arrangement may be used for a burglar alarm aswell or for a combined burglar and lfire alarm of any type, because theoperation which starts the relay action is -jfrnerely `a short timedclosing of a circuit. Moreover it -is clear that some of the detailsdescribed Yare quite unessential and may be replaced -by others withoutin any way affecting theioperation or the result. Therefore only thoseconstructions are to be regarded as essential which have been includedAin the annexed claims.

Having described the invention, what is claimed as new is:

1. An alarm systemfor use in connection with a subscribers telephonestation and line comprising an endless record, Y'means for'driving thesame, VVan operative circuit for said driving means, means 'iortranslating 'the record into telephone currents, :means Afortransmitting the telephone cur'ents over the telephone line, a diallingcircuit, means foi-dialling the number oi a predetermined alarm stationand an operative circuit for the same, means including a relaycontrolling the operative circuits of rthe record driving means and ofthe dialling means, an operative relay circuit, =alarm contacts forclosing said circuit and means `forholdin'g 'the relay in its operativepo'- sition after it has been energized.

2. An alarm system 'for use in connection with a subscribers 'telephonestation and line comprisingA an endless record, ineans'ior driving thesame continuously, an operative circuit for said driving fm'e'ans, ameans for picking up the Vrecorded message 'from 'the record and fortranslating fit 'into telephone currents delivered to the telephone'line, a #dialling 'circuit lassociated with the subscribers line, meansfor dialling the number of a predetermined alarm station, means forrepeating said dialling at xed time intervals, an operative circuit forsaid dialling means, means including a relay controlling the operativecircuits of said record driving and dialling means, an operative circuitfor said relay, alarm convtacts for closing said operative relaycircuit, re-

lay contacts and means operated by said relay for bringing the relaycontacts permanently into' alarm contacts, a relay armature, a pluralityof relay contacts moved to and remaining in a definite contact positionafter each actuation of the relay armature, an endless record andelectric driving means for the same, an operative circuit for saiddriving means, controlled by one of said relay contacts, a pick up fortranslating the record impulses into telephone currents, means fortransmitting said telephone currents to the telephone line, a normallyopen dialling circuit closed by the lrelay contacts associated with thesubscriber station.

4. An alarm system for use in connection with a subscribers telephonestation and line comprising an endless record, means for driving thesame, an operative circuit for said driving means, means for translatingthe record into telephone feo currents, means for transmitting thetelephone currents over the telephone line, a dialling circuit, meansfor dialling the number of a predetermined alarm station and anoperative circuit for the same, a relay, including. an armature, a setof fixed and a set of movable contact springs, said movable contactsprings being mounted on a tiltable member movable between twopositions, means operated by said armature at each energization fortilting said tiltable member, said set of contact springs controllingthe operative circuits of the record driving means and of the diallingmeans, an operative relay circuit, and alarm contacts for closing saidcircuit.

5. A relay for the alarm system as claimed in claim 4, comprising a pushmember pivotally connected with the armature, a contact supported bysaid tiltable member, the set of movable contact springs lbeing mountedon said plate, and a swing member operatively connected With saidtiltable member and pushed .by said push member for changing theposition of the tiltable contact supporting member each time it is movedby said push member.

6. A relay for the alarm system as claimed in claim 4, comprising a baseplate, a channel shaped push member pivotally connected with the relayarmature, a set of fixed contacts mounted on said base member, a pivotpin for pivotally supporting said tiltable member on said base plate, aswing member pivoted on the same pivot and provided with shoulders oneach side arranged within and cooperating with the channel shaped pushmember, a curved spring attached to said tiltable member and said swingmember respectively, the latter being pushed by said push member uponoperation of the armature moving from one side of the channel shapedmember to the other side upon each operation and thus moving thetiltable member by the spring connection, and a contact plate carried'by said tiltable member, saidcontact plate carrying the set of movablecontacts.

7. An alarm systemv for use in connection with a subscribers telephonestation and line, comprising an alarm circuit including alarm contacts,a relay and an operative circuit therefor, controlled by the alarmcontacts, a relay armature, a plurality of relay contacts moved to andremaining in a definite contact position after each actuation oi therelay armature, an endless record and electric driving `means for thesame, an operative circuit for said driving means, controlled by one ofsaid relay contacts, a pick up for translating the record impulses intotelephone currents, means ior transmitting said telephone currents tothe telephone line, a dialling circuit controlled by one of the relaycontacts, a pair of dialling impulse springs in said circuit, a slideadapted to be moved for supporting said impulse springs, an impulse diskprovided with impulse producing means, arranged for rotation near saidimpulse springs, said impulse springs being actuated at predeterminedintervals for a predetermined number of impulses upon rotation `of saiddisk, means for rotating said disk connected with the record drivingmeans, and means for moving said slide and impulse springs into and outof cooperative relation with the impulse producing means on the disk.

8. An alarm system as claimed in claim 'l wherein the slide carrying theimpulse springs is moved by a solenoid, an operative circuit for saidsolenoid, said circuit being controlled by the` movable contact springof the relay.

9. An alarm system as claimed in claim 7 wherein the disk is providedwith a cut, and the slide is provided with a roller passing through saidcut, a solenoid for moving the slide and an operative circuit for saidsolenoid, controlled by the movable relay contacts, the slide and theimpulse springs being held in its operative position with respect to theimpulse producing means during a full rotation of the disk by the rollerpassing through the cut oi the disk and held by the same duringrotation.

10. An alarm system for use in connection with a subscribers telephonestation and line comprising an alarm circuit including alarm contacts, arelay and an operative circuit therefor, controlled by the alarmcontacts, a relay armature, a plurality of relay contacts moved to andremaining ina definite contact 'position after each actuation of therelay armature, an endless record and electric driving means for thesame, an operative circuit for said driving means, controlled by one ofsaid relay contacts, a pick up for translating the record impulses intotelephone currents, means for transmitting said telephone currents tothe telephone line, a dialling circuit controlled by one of the relaycontacts, a pair of dialling impulse springs in said circuit, a slideadapted to be moved for supporting said impulse springs, an impulse diskprovided with impulse producing means, arranged for, rotation near saidimpulse springs, said impulse springs being actuated at predeterminedintervals for a predetermined number of impulses upon rotation of saiddisk, means for rotating said disk connected with the record drivingmeans, a solenoid for moving said slide, moving the impulse springs outof operation with the impulse producing means, an operative circuit `forthe solenoid, controlled by the movable contact springs of the relay,pairs of further controlling springs in said operative circuit of thesolenoid, a cam member on said impulse disk,

closing one pair of said springs once during each revolution of saidimpulse disk, a second disk operatively connected with the iirst diskbut rotating at a slower speed, a cam member on said seconddisk forclosing a further pair of said controlling springs once during eachrevolution of said second disk and means on said slide for keeping theimpulse spring in operative relationship to the impulse producing meansduring one revolution of the impulse disk after each closing of thesolenoid circuit.

11. An alarm system for use in connection with a subscribers telephonestation and line comprising an endless record, means for driving thesame continuously, an Voperative circuit for said driving means, a meansfor picking up the recorded message from the record and for translatingit into telephone currents delivered toy the telephone line, a diallingcircuit associated with the subscribers line, means for dialling thenumber of a predetermined alarm station, means for repeating saiddialling at xed time intervals, an operative circuit for said diallingmeans, a relay ycontrolling the operative circuits of said recorddriving and dialling means, an operative circuit for said relay, alarmcontacts for closing said operative relay circuit, relay contacts andmeans operated with said relay for bringing the relay contactspermanently into an operative position upon operation of the relay, andmeans for energizing the relay, a second tune after the rst energizationcontrolled by the called substation returning movable contact springsback into their original position.

12. An alarm system for use in connection with a subscriber-s telephonestation and line comprisingan endless record. means for driving the samecontinuously, an operative circuit for said driving means, a means forpicking up the recorded message from the record and for translating itinto telephone currents delivered to the telephone line, a. diallingcircuit associated with the subscribers line, means for dialling thenumber of a predetermined alarm station, means for repeating saiddialling at xed time intervals, an operative circuit y for said diallingmeans, a relay controlling the operative circuits of said record drivingand dialling means, an operative circuit for said relay, alarm contactsfor closing said operative relay circuit,rrelay contacts and meansoperated `by said relay for bringing the relay contacts permanently intoan operative position upon operation of the relay, an electromagnetoperated by a special energizing current, controlling an energizingcircuity of the relay, said energizing circuit being further controlledby one of the relay contacts, an energizing circuit for saidelectromagnet, connected with the telephone line, and means located inthe predetermined alarm station for sending an energizing currentthrough said energizing circuit.

DAVID B. TALBOT.

REFERENCES CITED The following references are of record in the Bell Oct.26, 1943

